feat: move to postcss-value-parser

[gluck]

• add unit tests with vitest -> requires tsconfig skipLibCheck as per: https://github.com/figma/plugin-typings/issues/96

• also use colord (with names plugin) for color normalization

• now supports all color types (including names and transparency)

• now supports diagonal directions

• now supports length w/o unit (px is implicit)

TODO:

• [x] support radial-gradient numeric size

Future:

• support conic-gradient ? (mappable to figma ?)
• support color hints ? (will have to interpolate the middle color)

[yagudaev]

Wow 🤩 . You are something else my friend.

This is incredible, left a few quick comments. I still need to grok this whole thing. Amazing start, I'm really excited to see us shape this.

I'll review the CSS spec again, there are interesting concepts there like:

gradient line (which, depending on the type of gradient, may geometrically be a line, or a ray, or a spiral)

This is probably the key to supporting other gradient types well.

Looking forward to hearing your thoughts.

[yagudaev]

Wow incredible job seriously don't know how you did it! Opened another PR #18 that does some further refactoring to clean things up.

I'll close this one and prep that one more tomorrow, it's almost there!